2a6169a952
Render texture finished custom render item added pivot added to display object grunt file updated docs updated
353 lines
12 KiB
HTML
353 lines
12 KiB
HTML
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<title>src/pixi/text/Text.js - Pixi.JS</title>
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<li><a href="../classes/AssetLoader.html">AssetLoader</a></li>
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<li><a href="../classes/BitmapFontLoader.html">BitmapFontLoader</a></li>
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<li><a href="../classes/Stage.html">Stage</a></li>
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<li><a href="../classes/Text.html">Text</a></li>
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<div class="content">
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<h1 class="file-heading">File: src/pixi/text/Text.js</h1>
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<div class="file">
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<pre class="code prettyprint linenums">
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/**
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* @author Mat Groves http://matgroves.com/ @Doormat23
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*/
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/**
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* A Text Object will create a line(s) of text to split a line you can use "\n"
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* @class Text
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* @extends Sprite
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* @constructor
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* @param {String} text The copy that you would like the text to display
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* @param {Object} [style] The style parameters
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* @param {String} [style.font] default "bold 20pt Arial" The style and size of the font
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* @param {Object} [style.fill="black"] A canvas fillstyle that will be used on the text eg "red", "#00FF00"
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* @param {String} [style.align="left"] An alignment of the multiline text ("left", "center" or "right")
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* @param {String} [style.stroke] A canvas fillstyle that will be used on the text stroke eg "blue", "#FCFF00"
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* @param {Number} [style.strokeThickness=0] A number that represents the thickness of the stroke. Default is 0 (no stroke)
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*/
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PIXI.Text = function(text, style)
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{
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this.canvas = document.createElement("canvas");
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this.context = this.canvas.getContext("2d");
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PIXI.Sprite.call(this, PIXI.Texture.fromCanvas(this.canvas));
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this.setText(text);
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this.setStyle(style);
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this.updateText();
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this.dirty = false;
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};
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// constructor
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PIXI.Text.constructor = PIXI.Text;
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PIXI.Text.prototype = Object.create(PIXI.Sprite.prototype);
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/**
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* Set the style of the text
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* @method setStyle
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* @param {Object} [style] The style parameters
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* @param {String} [style.font="bold 20pt Arial"] The style and size of the font
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* @param {Object} [style.fill="black"] A canvas fillstyle that will be used on the text eg "red", "#00FF00"
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* @param {String} [style.align="left"] An alignment of the multiline text ("left", "center" or "right")
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* @param {String} [style.stroke] A canvas fillstyle that will be used on the text stroke eg "blue", "#FCFF00"
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* @param {Number} [style.strokeThickness=0] A number that represents the thickness of the stroke. Default is 0 (no stroke)
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*/
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PIXI.Text.prototype.setStyle = function(style)
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{
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style = style || {};
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style.font = style.font || "bold 20pt Arial";
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style.fill = style.fill || "black";
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style.align = style.align || "left";
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style.strokeThickness = style.strokeThickness || 0;
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this.style = style;
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this.dirty = true;
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};
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/**
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* Set the copy for the text object. To split a line you can use "\n"
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* @methos setText
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* @param {String} text The copy that you would like the text to display
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*/
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PIXI.Sprite.prototype.setText = function(text)
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{
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this.text = text || " ";
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this.dirty = true;
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};
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/**
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* Renders text
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* @private
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*/
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PIXI.Text.prototype.updateText = function()
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{
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this.context.font = this.style.font;
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//split text into lines
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var lines = this.text.split(/(?:\r\n|\r|\n)/);
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//calculate text width
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var lineWidths = [];
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var maxLineWidth = 0;
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for (var i = 0; i < lines.length; i++)
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{
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var lineWidth = this.context.measureText(lines[i]).width;
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lineWidths[i] = lineWidth;
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maxLineWidth = Math.max(maxLineWidth, lineWidth);
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}
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this.canvas.width = maxLineWidth + this.style.strokeThickness;
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//calculate text height
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var lineHeight = this.determineFontHeight("font: " + this.style.font + ";") + this.style.strokeThickness;
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this.canvas.height = lineHeight * lines.length;
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//set canvas text styles
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this.context.fillStyle = this.style.fill;
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this.context.font = this.style.font;
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this.context.strokeStyle = this.style.stroke;
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this.context.lineWidth = this.style.strokeThickness;
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this.context.textBaseline = "top";
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//draw lines line by line
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for (i = 0; i < lines.length; i++)
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{
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var linePosition = new PIXI.Point(this.style.strokeThickness / 2, this.style.strokeThickness / 2 + i * lineHeight);
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if(this.style.align == "right")
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{
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linePosition.x += maxLineWidth - lineWidths[i];
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}
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else if(this.style.align == "center")
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{
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linePosition.x += (maxLineWidth - lineWidths[i]) / 2;
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}
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if(this.style.stroke && this.style.strokeThickness)
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{
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this.context.strokeText(lines[i], linePosition.x, linePosition.y);
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}
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if(this.style.fill)
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{
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this.context.fillText(lines[i], linePosition.x, linePosition.y);
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}
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}
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this.updateTexture();
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};
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/**
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* Updates texture size based on canvas size
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* @private
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*/
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PIXI.Text.prototype.updateTexture = function()
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{
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this.texture.baseTexture.width = this.canvas.width;
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this.texture.baseTexture.height = this.canvas.height;
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this.texture.frame.width = this.canvas.width;
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this.texture.frame.height = this.canvas.height;
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this._width = this.canvas.width;
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this._height = this.canvas.height;
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PIXI.texturesToUpdate.push(this.texture.baseTexture);
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};
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/**
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* @private
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*/
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PIXI.Text.prototype.updateTransform = function()
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{
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if(this.dirty)
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{
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this.updateText();
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this.dirty = false;
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}
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PIXI.Sprite.prototype.updateTransform.call(this);
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};
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/*
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* http://stackoverflow.com/users/34441/ellisbben
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* great solution to the problem!
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*/
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PIXI.Text.prototype.determineFontHeight = function(fontStyle)
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{
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// build a little reference dictionary so if the font style has been used return a
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// cached version...
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var result = PIXI.Text.heightCache[fontStyle];
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if(!result)
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{
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var body = document.getElementsByTagName("body")[0];
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var dummy = document.createElement("div");
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var dummyText = document.createTextNode("M");
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dummy.appendChild(dummyText);
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dummy.setAttribute("style", fontStyle);
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body.appendChild(dummy);
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result = dummy.offsetHeight;
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PIXI.Text.heightCache[fontStyle] = result;
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body.removeChild(dummy);
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}
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return result;
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};
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PIXI.Text.prototype.destroy = function(destroyTexture)
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{
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if(destroyTexture)
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{
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this.texture.destroy();
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}
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};
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PIXI.Text.heightCache = {};
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</pre>
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</div>
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